ASTM C348-14
(Test Method)Standard Test Method for Flexural Strength of Hydraulic-Cement Mortars
Standard Test Method for Flexural Strength of Hydraulic-Cement Mortars
SIGNIFICANCE AND USE
4.1 This test method provides a means for determining the flexural strength of hydraulic cement mortars. Portions of the mortar prisms tested in flexure according to this test method may be used for the determination of compressive strength in accordance with Test Method C349.
4.2 The values are determined from this test method for research or reference purposes only and are not used for determining compliance with specification requirements.
SCOPE
1.1 This test method covers the determination of the flexural strength of hydraulic-cement mortars.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 Values in SI units shall be obtained by measurement in SI units or by appropriate conversion, using the Rules for Conversion and rounding given in Standard IEEE/ASTM SI 10, of measurements made in other units.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.2)
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Designation: C348 − 14
Standard Test Method for
1
Flexural Strength of Hydraulic-Cement Mortars
This standard is issued under the fixed designation C348; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* Pastes and Mortars of Plastic Consistency
C349Test Method for Compressive Strength of Hydraulic-
1.1 Thistestmethodcoversthedeterminationoftheflexural
Cement Mortars (Using Portions of Prisms Broken in
strength of hydraulic-cement mortars.
Flexure)
1.2 The values stated in SI units are to be regarded as
C670Practice for Preparing Precision and Bias Statements
standard. No other units of measurement are included in this
for Test Methods for Construction Materials
standard.
C778Specification for Standard Sand
C1005Specification for Reference Masses and Devices for
1.3 Values in SI units shall be obtained by measurement in
SI units or by appropriate conversion, using the Rules for Determining Mass and Volume for Use in the Physical
Testing of Hydraulic Cements
Conversion and rounding given in Standard IEEE/ASTM SI
10, of measurements made in other units. C1437Test Method for Flow of Hydraulic Cement Mortar
IEEE/ASTM SI 10Standard for Use of the International
1.4 This standard does not purport to address all of the
System of Units (SI): The Modern Metric System
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3. Summary of Test Method
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. (Warning—Fresh
3.1 The test mortar used consists of 1 part cement and 2.75
hydraulic cementitious mixtures are caustic and may cause
parts of sand proportion by mass. Portland or air-entraining
2
chemical burns to skin and tissue upon prolonged exposure. )
portland cements are mixed at specified water-cement ratios.
1.5 This international standard was developed in accor-
Water content of other cements is that sufficient to obtain a
dance with internationally recognized principles on standard-
flowof110 65%with25dropsoftheflowtable.Testprisms,
ization established in the Decision on Principles for the
40 by 40 by 160-mm, are molded by tamping in two layers.
Development of International Standards, Guides and Recom-
Prisms are cured one day in the molds and stripped until tested
mendations issued by the World Trade Organization Technical
by center point loading.
Barriers to Trade (TBT) Committee.
4. Significance and Use
2. Referenced Documents
4.1 This test method provides a means for determining the
3
2.1 ASTM Standards:
flexural strength of hydraulic cement mortars. Portions of the
C109/C109MTest Method for Compressive Strength of
mortar prisms tested in flexure according to this test method
Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube
may be used for the determination of compressive strength in
Specimens)
accordance with Test Method C349.
C230/C230MSpecification for Flow Table for Use in Tests
4.2 The values are determined from this test method for
of Hydraulic Cement
research or reference purposes only and are not used for
C305Practice for Mechanical Mixing of Hydraulic Cement
determining compliance with specification requirements.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC01onCement 5. Apparatus
and is the direct responsibility of Subcommittee C01.27 on Strength.
5.1 Weights, Weighing Devices and Glass Graduates, shall
Current edition approved Dec. 1, 2014. Published December 2014. Originally
approved in 1954. Last previous edition approved in 2008 as C348–08. DOI:
conform to the requirements of Specification C1005. The
10.1520/C0348-14.
balance shall be evaluated for precision and accuracy at
2
See the section on Safety, Manual of Cement Testing, Annual Book of ASTM
2000g.
Standards, Vol 04.01.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2 Mixer,BowlandPaddle,anelectricallydrivenmechani-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
cal mixer of the type equipped with paddle and mixing bowl,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. as specified in the Apparatus Section of Practice C305.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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C348 − 14
5.3 Flow Table and Flow Mold, shall conform to Specifica- 5.8 Flexure Testing Device—The centerpoint loading
tion C230/C230M. metho
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C348 − 08 C348 − 14
Standard Test Method for
1
Flexural Strength of Hydraulic-Cement Mortars
This standard is issued under the fixed designation C348; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This test method covers the determination of the flexural strength of hydraulic-cement mortars.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 Values in SI units shall be obtained by measurement in SI units or by appropriate conversion, using the Rules for Conversion
and rounding given in Standard IEEE/ASTM SI 10, of measurements made in other units.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and
2
tissue upon prolonged exposure. )
2. Referenced Documents
3
2.1 ASTM Standards:
C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens)
C230/C230M Specification for Flow Table for Use in Tests of Hydraulic Cement
C305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency
C349 Test Method for Compressive Strength of Hydraulic-Cement Mortars (Using Portions of Prisms Broken in Flexure)
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
C778 Specification for Sand
C1005 Specification for Reference Masses and Devices for Determining Mass and Volume for Use in the Physical Testing of
Hydraulic Cements
C1437 Test Method for Flow of Hydraulic Cement Mortar
IEEE/ASTM SI 10 Standard for Use of the International System of Units (SI): The Modern Metric System
3. Summary of Test Method
3.1 The test mortar used consists of 1 part cement and 2.75 parts of sand proportion by mass. Portland or air-entraining portland
cements are mixed at specified water-cement ratios. Water content of other cements is that sufficient to obtain a flow of 110 6 5 %
with 25 drops of the flow table. Test prisms, 40 by 40 by 160-mm160-mm, are molded by tamping in two layers. Prisms are cured
one day in the molds and stripped until tested by center point loading.
4. Significance and Use
4.1 This test method provides a means for determining the flexural strength of hydraulic cement mortars. Portions of the mortar
prisms tested in flexure according to this test method may be used for the determination of compressive strength in accordance
with Test Method C349.
4.2 The values are determined from this test method for research or reference purposes only and are not used for determining
compliance with specification requirements.
1
This test method is under the jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of Subcommittee C01.27 on Strength.
Current edition approved Dec. 1, 2008Dec. 1, 2014. Published January 2009December 2014. Originally approved in 1954. Last previous edition approved in 20022008
as C348 – 02.C348 – 08. DOI: 10.1520/C0348-08.10.1520/C0348-14.
2
See the section on Safety, Manual of Cement Testing, Annual Book of ASTM Standards, Vol 04.01.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C348 − 14
5. Apparatus
5.1 Weights, Weighing Devices and Glass Graduates, shall conform to the requirements of Specification C1005. The balance
shall be evaluated for precision and accuracy at 2000 g.2000 g.
5.2 Mixer, Bowl and Paddle, an electrically driven mechanical mixer of the type equipped with paddle and mixing bowl, as
specified in the Apparatus Section of Practice C305.
5.3 Flow Table and Flow Mold, shall conform to Specification C23
...
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